Arduino sketch for analog UV sensor.
This small (type-less) UV-sensor is powered by 3.3 .. 5 V so it can be used by almost any microprocessor.
The sensor has an analogue output that is roughly linear with the UV-index (sunlight assumed, see notes)
| Voltage | UV index | risk of harm | Colour |
|---|---|---|---|
| <0.050 | 0 | low | Green |
| 0.227 | 1 | low | Green |
| 0.318 | 2 | low | Green |
| 0.408 | 3 | moderate | Yellow |
| 0.503 | 4 | moderate | Yellow |
| 0.606 | 5 | moderate | Yellow |
| 0.696 | 6 | high | Orange |
| 0.795 | 7 | high | Orange |
| 0.881 | 8 | very high | Red |
| 0.976 | 9 | very high | Red |
| 1.079 | 10 | very high | Red |
| 1.170> | 11 | extreme | Purple |
From this table the formula is derived (spreadsheet) which is pretty linear between UV 1 and 11.
There is an extended library version which has more functionality and documentation.
Note: The sensor is not calibrated and the table is indicative for sunlight (assumption!) and therefore not suitable for e.g. medical or industrial usage.
Note: UV radiation will not go through glass, so inside you will most likely always read zero. This may help to calibrate the zero level of the sensor.
Note: depending on the light source used, the table above is incorrect.
The sensor is sensitive for wavelengths from 200 - 370 nm, so mostly in UVB and UVA region and less in the UVC.
https://en.wikipedia.org/wiki/Ultraviolet
Future development will be done in the library version only.
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